1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // UNSUPPORTED: libcpp-has-no-threads
11 // UNSUPPORTED: c++98, c++03, c++11
17 // class shared_timed_mutex;
19 // template <class Clock, class Duration>
20 // shared_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time);
22 #include <shared_mutex>
28 #include "test_macros.h"
30 std::shared_timed_mutex m;
32 typedef std::chrono::steady_clock Clock;
33 typedef Clock::time_point time_point;
34 typedef Clock::duration duration;
35 typedef std::chrono::milliseconds ms;
36 typedef std::chrono::nanoseconds ns;
38 ms WaitTime = ms(250);
40 // Thread sanitizer causes more overhead and will sometimes cause this test
41 // to fail. To prevent this we give Thread sanitizer more time to complete the
43 #if !defined(TEST_HAS_SANITIZERS)
44 ms Tolerance = ms(50);
46 ms Tolerance = ms(50 * 5);
51 time_point t0 = Clock::now();
52 std::shared_lock<std::shared_timed_mutex> lk(m, Clock::now() + WaitTime + Tolerance);
53 assert(lk.owns_lock() == true);
54 time_point t1 = Clock::now();
55 ns d = t1 - t0 - WaitTime;
56 assert(d < Tolerance); // within 50ms
61 time_point t0 = Clock::now();
62 std::shared_lock<std::shared_timed_mutex> lk(m, Clock::now() + WaitTime);
63 assert(lk.owns_lock() == false);
64 time_point t1 = Clock::now();
65 ns d = t1 - t0 - WaitTime;
66 assert(d < Tolerance); // within 50ms
73 std::vector<std::thread> v;
74 for (int i = 0; i < 5; ++i)
75 v.push_back(std::thread(f1));
76 std::this_thread::sleep_for(WaitTime);
83 std::vector<std::thread> v;
84 for (int i = 0; i < 5; ++i)
85 v.push_back(std::thread(f2));
86 std::this_thread::sleep_for(WaitTime + Tolerance);